近期，德国弗莱堡大学Cornelia Klose教授在Molecular plant 发表了题为Thermal Reversion of Plant Phytochromes 的综述文章，该文对光敏色素热逆转(thermal reversion)的相关研究作了综述。

光敏色素是植物生长发育所必需的红色/远红光可逆光受体。光敏色素信号是由生理活性的远红光吸收型(Pfr)所介导的，这种形式可以通过依赖于光的光转换或不依赖于光的热逆转（也称为暗逆转[dark reversion]）失活到红光吸收型 (Pr)。虽然术语“暗逆转”是有历史根据的，并且经常在文献中使用，但“热逆转”更恰当地描述了不依赖于光但受温度控制的Pfr松弛过程，这种松弛过程不仅发生在黑暗中，也发生在光中，因此将在本综述中使用。热逆转是光敏色素介导的反应的光敏感反应的一个关键参数，已经被研究了几十年，经常导致相互矛盾的发现。热逆转是光敏色素分子的固有属性，但可以通过分子内和分子间的相互作用以及生物化学修饰(如磷酸化)来调节。

在这篇综述中，作者概述了光敏色素热逆转的研究历史，强调了在了解分子基础之前已经做出的重要预测。并且进一步总结和讨论了光敏色素热逆转的分子调控机制及其在植物光温传感中等方面的最新研究成果。

A Model Illustrating the Role of phyB Thermal Reversion in Light and Temperature Sensing

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摘要：

Phytochromes are red/far-red reversible photoreceptors essential for plant growth and development. Phytochrome signaling is mediated by the physiologically active far-red-absorbing Pfr form that can be inactivated to the red-absorbing Pr ground state by light-dependent photoconversion or by light-independent thermal reversion, also termed dark reversion. Although the term ‘‘dark reversion’’ is justified by historical reasons and frequently used in the literature, ‘‘thermal reversion’’ more appropriately describes the process of light-independent but temperature-regulated Pfr relaxation that not only occurs in darkness but also in light and is used throughout the review. Thermal reversion is a critical parameter for the light sensitivity of phytochrome-mediated responses and has been studied for decades, often resulting in contradictory findings. Thermal reversion is an intrinsic property of the phytochrome molecules but can be modulated by intra- and intermolecular interactions, as well as biochemical modifications, such as phosphorylation. In this review, we outline the research history of phytochrome thermal reversion, highlighting important predictions that have been made before knowing the molecular basis. We further summarize and discuss recent findings about the molecular mechanisms regulating phytochrome thermal reversion and its functional roles in light and temperature sensing in plants.

文章链接：https://doi.org/10.1016/j.molp.2019.12.004